Compensating rope for hoisting apparatus



Aprll 19, 1927. F. HYMANS COMPENSATING ROPE FOR HOISTING APPARATUS FiledAug. 50. 1924 l 0 U A L \\\\\\H r/ r r/// //7 /d g A. v 3 6 6 5 6 74% V//////V .F/aZ 1 anveuwi Patented Apr. 19, 1927.

UNITED STATES PATENT OFFICE.

FREDERICK HYMANS, OF YONIKERS, NEW YORK, ASSIGNOR TO OTIS ELEVATOR COM-PANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

GOMPENSATING ROPE FOR I-IOISTING APPARATUS.

Application filed August 30, 1924. Serial No. 735,180.

This invention relates to hoisting appahoisting ropes. Therefore, toeffect full ratus and more particularly to means for compensation forchanges in weight of the 55 compensating "for the change in weight, duetwo portions of the hoisting ropes, the to the change in length, of theropes between weight per unit length of the compensating a body and thedrum from which it is susrope is made equal to the weight per unitpended. As the body is raised and lowered length of the hoisting ropes.the weight of the ropes between the hoisting Referring to Figure 1, thenumber of 60 mechanism and the body decreases and inhoisting ropes isshown as five. Hence, the

creases and to compensate for this change in combined weight of masses 6and rope 5 10 weight, means are provided for subtracting is made equalper unit length to the weight and adding weight to the suspended body ofthe five hoisting ropes 2. By such conas it moves up and down.struction, the total Weight of the hoisting 65 The object or theinvention is to provide ropes and the compensating rope is equallysimple and economical compensation which divided at all times betweenthe two sides will be noiseless in operation and durable. of the sheave,regardless of the position of A preferred embodiment of the inventionthe car.

as applied to an elevator system will be de- The masses 6 (see Figure 2)are prefer- 70 scribed in connection with the accompanyably of materialhaving a high specific lng drawings, in which, gravity, as for example,lead or babbitt, and Figure 1 is a schematic view or" an elevator may becast in position in spaced relation system embodying the invention. toone another to firmly grip the rope 5,

Figure 2 is a detail sectional view of a or the masses 6 may be pressedin place by 7 portion of the compensating means. pressure appliedexternally. For a given Figure 3 is a detail sectional view of aspacing, the length of contact with which portion of another embodimentof the comthe mass 6 engages the rope 5 will have a pensating means.definite efi'ect in reducing flexibility and in- Figure 1 is afragmentary view taken at creasing local bending of the rope. In orderright angles to Figure 1 and showing the that each mass may have itsmajor axis hoisting ropes at their point of connection disposedlongitudinally of the rope, as is so to the elevator car. preferable,while avoiding undue length of Referring to Figure 1, the hoistingmechcontact with the rope, each mass may have auism is shown ascomprising a grooved a clearance recess 8 at one or both ends. sheave 1over which passes a set of ropes 2. A determining factor in the lengthof con- On one side of sheave 1 is suspended an tact is the amount ofsurface which must be elevator car 3, while from the other side is inengagement to maintain the masses in suspended a counterweight 1. Acolnpcntheir proper positions on the rope.

sating rope 5 having one end attached to the In Figure 3, thecompensating rope is counterweightand its other end to the eleshown ascomprising two ropes 9 and 10, vator car, hangs freely suspended in theone a right lay and the other alett lay, and

i0 hatchwa-y. Masses 6 of suitable material are the masses 11 may insuch cases embrace the secured to rope 5 at spaced intervals. As pair ofropes and be secured thereon in a the hoisting mechanism is operated toraise manner similar to that described'in connecthe elevator car 3, theportion of hoisting tion with Figure 2. This combination has ropes 2between car 3 and sheave 1 decreases no tendency to spin.

45 in length while the portion of ropes 2 be- It has been found thatcompensating ropes tween counterweight i and sheave 1 inconstructed inaccordance with this invencreases in length. At the same time theportion operate noiselessly, are easy to install tion of compensatingrope 5 between its and have low cost of upkeep. The pressing lowestpoint 7 and car 3 increases in length or molding ot' the mass elementsin place, while the portion between point 7 and counprovides for theirfirm contact or engageterweight l decreases in length, these ment withthe contour of the rope, thus changes in length being equal to themaking them secure. It is apparent that changes in length of theportions of the ther forms of roping, both as to the hoisting ropes andcompensating rope, may be employed Without departing from the scope ofthis invention.

lVhat is claimed is Compensating means for hoisting apparatus ropescomprising a pair of ropes of right and left lay respectively, and aplu-v rality of mass elements embracing said pair of ropes and securedin spaced re filtlOD thereon. 10

FREDERICK HYMANS.

